/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.core.construction;



import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import java.util.function.Function;

import com.bff.gaia.unified.model.expansion.v1.ExpansionApi;

import com.bff.gaia.unified.model.expansion.v1.ExpansionServiceGrpc;

import com.bff.gaia.unified.model.pipeline.v1.Endpoints;

import com.bff.gaia.unified.vendor.grpc.v1p13p1.io.grpc.ManagedChannel;



/** Default factory for ExpansionServiceClient used by External transform. */

public class DefaultExpansionServiceClientFactory implements ExpansionServiceClientFactory {

  private Map<Endpoints.ApiServiceDescriptor, ExpansionServiceClient> expansionServiceMap;

  private Function<Endpoints.ApiServiceDescriptor, ManagedChannel> channelFactory;



  DefaultExpansionServiceClientFactory(

      Function<Endpoints.ApiServiceDescriptor, ManagedChannel> channelFactory) {

    this.expansionServiceMap = new ConcurrentHashMap<>();

    this.channelFactory = channelFactory;

  }



  @Override

  public void close() throws Exception {

    for (ExpansionServiceClient client : expansionServiceMap.values()) {

      try (AutoCloseable closer = client) {}

    }

  }



  @Override

  public ExpansionServiceClient getExpansionServiceClient(Endpoints.ApiServiceDescriptor endpoint) {

    return expansionServiceMap.computeIfAbsent(

        endpoint,

        e ->

            new ExpansionServiceClient() {

              private final ManagedChannel channel = channelFactory.apply(endpoint);

              private final ExpansionServiceGrpc.ExpansionServiceBlockingStub service =

                  ExpansionServiceGrpc.newBlockingStub(channel);



              @Override

              public ExpansionApi.ExpansionResponse expand(ExpansionApi.ExpansionRequest request) {

                return service.expand(request);

              }



              @Override

              public void close() throws Exception {

                channel.shutdown();

              }

            });

  }

}